Hook Range #28 to #4/0 The Renzetti Bent Shaft Design is covered under the US Reg # 2535148 If you use a variety of hook styles and sizes, you&';ll appreciate the versatility of the Presentation 4000 Cam Series Vises. It offers two rotary tension adjustments, one to preset the desired level of tension for your basic tying needs, and the other to add tension or hold the rotary shaft in the desired position.